I'm not sure what the actual burn time is, but fusible links in general are slow burn. They are designed to tolerate overloads for short periods, but they should burn out before the wire is damaged. If I were doing this repair, assuming new OE parts are non-available, I would try to find a used one (perhaps one of those on-line parts locators). If that didn't pan out and I was stuck with a non-stock repair, I'd probably use resetable DC breakers or slow burn fuses of the same values. Tim